If you take both metformin and tirzepatide, your risk of B12 deficiency is compounded (no pun intended)
Nature , 432(7016), 466472
Many people feel a noticeable energy lift within hours of their B12 injection, with the maximum benefit usually appearing one to two days later
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Examples of foods that contain vitamin B12 include: Meat Fish Shellfish Eggs Dairy Fortified grain products You can also get vitamin B12 from a multivitamin supplement or prescription medication